FX.co ★ Japan’s National Core CPI Eases to 1.7% in August, Slightly Below July Reading

Japan’s National Core Consumer Price Index (CPI) rose 1.7% year-over-year in August 2026, easing slightly from a 1.8% gain recorded in July 2026. The data, updated on 17 September 2026, indicate a modest slowdown in underlying inflation pressures.

The National Core CPI measures price changes excluding volatile components and compares each month’s level with the same month a year earlier. In this case, the August figure reflects how prices have changed versus August of the previous year, while the July reading was measured against July a year earlier. The marginal deceleration from 1.8% to 1.7% suggests that price growth remains relatively contained on an annual basis.

Market participants and policymakers closely track core inflation for signals on the broader price trend, as it strips out short-term volatility. The latest figures imply that, at least for now, Japan’s underlying inflation dynamics are stable, with no sharp acceleration in year-over-year price growth evident in the August data.